Back door / Backdoor

3. An undocumented or hidden entry into a computer system that permits unauthorized access to programs and/or data. Some early voting systems had backdoors that permitted developers to access system functionality without logins.

Source: Glossary - Introduction to Information Technology for Election Officials, U.S. Election Assistance Commission,

2. An unnoticed, hidden entry into a network or system that allows hackers to “sneak” in without an authorized login or password.

Source: Guide to Cybersecurity as Risk Management: The Role of Elected Officials, Governing Institute, CGI,

3. Typically unauthorized hidden software or hardware mechanism used to circumvent security controls. (CNSSI-4009) (NISTIR)

Source: The Cyber Glossary, National Security Archive, George Washington University,

4. An intentionally designed vulnerability that enables access to a computer system.

Source: U.S. Cyberspace Solarium Commission, March 2020,